I bought these for a water shoe. They did great. I climbed a waterfall in them and they were excellent. Just make sure you wash them after you wear them in the water. They also kept a majority of sand and stuff out of the shoe, unlike normal water shoes.
Did they fit true to sizing? How did you pick out your size?
I had a pair prior to these and just got the same size. I wear a size 10 women, 8 men and so a 41 is the size a got. Pretty true to size, you probably want to look up a sizing chart. I believe the 41 is English sizing.